added simple logging library and example usage at the end (is this really different from python logging?)

trustify/client/logger.py

@@ -0,0 +1,118 @@
+
+import sys
+import time
+
+
+class Singleton(object):
+    _instance = None
+    def __new__(cls, *args, **kwargs):
+        if not cls._instance:
+            cls._instance = super(Singleton, cls).__new__(
+                                cls, *args, **kwargs)
+        return cls._instance
+
+
+# log levels
+TRACE=5
+DEBUG=4
+INFO=3
+WARN=2
+ERROR=1
+FATAL=0
+NONE=-1
+
+class Logger(Singleton):
+
+
+    debugLevelStr = {TRACE:'TRACE', DEBUG:'DEBUG', INFO:'INFO', \
+                     WARN:'WARN', ERROR:'ERROR', FATAL:'FATAL'}
+
+    def __init__(self):
+        self.level = INFO
+
+    def debugLevel(self, level=DEBUG):
+        return self.debugLevelStr[level]
+
+    def log(self, level, data):
+        raise Exception("Error: no Logger defined")
+
+
+
+
+class FileLogger(Logger):
+    def __init__(self, outfile):
+        self.outfile = outfile
+
+
+    def timefmt(self, t=None):
+        if t == None:
+            t = time.time()
+        return time.strftime("%b %d %Y %H:%M:%S", time.localtime(t)) + ('%.03f' % (t - int(t)))[1:]
+
+    def log(self, level, data):
+        msg = "%s [%s] %s\n" % (self.timefmt(), self.debugLevel(level), data)
+        self.outfile.write(msg)
+
+
+log_instance = None
+
+def setLogger(log_inst):
+    global log_instance
+    log_instance = log_inst
+    
+def setLogLevel(log_level):
+    global log_instance
+    log_instance.level = log_level
+
+def log(level, data):
+    global log_instance
+    if level <= log_instance.level:
+        log_instance.log(level, data)
+
+def trace(data):
+    log(TRACE, data)
+
+def debug(data):
+    log(DEBUG, data)
+
+def info(data):
+    log(INFO, data)
+
+def warn(data):
+    log(WARN, data)
+
+def error(data):
+    log(ERROR, data)
+
+def fatal(data):
+    log(FATAL, data)
+
+def none(data):
+    # Uh...what?
+    pass 
+
+
+if __name__ == "__main__":
+    # Unit test/example usage:
+    import logger
+
+    # Set the logging type you want to use (stdout logging):
+    logger.setLogger(FileLogger(sys.stdout))
+
+    # Set the most verbose you want to log (TRACE, DEBUG, INFO, WARN, ERROR, FATAL, NONE)
+    logger.setLogLevel(logger.INFO)
+
+    # Log a message:
+    logger.log(logger.INFO, "logger!")
+
+    time.sleep(0.01)
+
+    # Alternatively, use 
+    logger.error("errrrr")
+
+    logger.trace("some trace data: %d - %f - %s" % (5, 8.3, 'cows'))
+
+
+
+
+